Goar, Allison & Associates
licensed technology



Goar, Allison & Associates has provided the SUPERCLAUS process to several facilities in North America. We apply two principles when incorporating the SUPERCLAUS process into a Goar, Allison & Associates design package.

  1. The Claus plant is operated with excess H2S in order to suppress the SO2 content in the Claus tail gas. Alternatively, all sulfur components in the tail gas are converted to H2S by hydrogenation; and
  2. The remaining H2S in the Claus tail gas undergoes selective oxidation in the presence of a special catalyst, which efficiently converts the remaining H2S in the presence of water vapor and excess oxygen to elemental sulfur only.

The SUPERCLAUS catalyst possesses some unique properties:

  • Complete oxidation of H2S to sulfur with no sensitivity to water vapor
  • Further oxidation of SO2 is negligible, even in the presence of excess oxygen
  • Components such as H2, CO and other combustibles are not affected
  • The catalyst does not establish the Claus equilibrium reaction

The SUPERCLAUS process consists of a thermal stage followed by three or four catalytic reaction stages. The first two or three reactors are filled with Claus catalyst while the last reactor is filled with the selective oxidation catalyst. In the thermal stage, the acid gas is burnt with a sub-stoichiometric amount of controlled combustion air so that the tail gas leaving the second reactor contains 0.8% to 1.5% by volume of H2S.

The catalyst in the selective oxidation reactor oxidizes the H2S to sulfur at very high efficiency. Depending on the composition of the Claus feed gas, a total sulfur recovery in excess of 99% can be achieved since the catalyst neither oxidizes H2S to SO2 and H2O, nor reverses the reaction of sulfur and water to H2S and SO2.

Typical results include sulfur recovery of 99% to 99.5% for rich H2S streams; sulfur purity of 99.9%; and a reduction in SO2 emissions ranging from 50% to 90% of baseline SO2 emissions.

SUPERCLAUS® is a registered trademark of Jacobs Nederland B.V.

legal notice
© 2019 by Goar, Allison & Associates, LLC. COPE and D'GAASS are registered service marks of Fluor Corporation.

Goar, Allison & Associates